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CONVERTIBLE NOTES (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 18, 2014 USD ($) | Dec. 31, 2018 USD ($) D item $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |  |
Convertible notes |  |  | $ 126,476 |
Carrying value of convertible notes |  | $ 127,428 |  |
2014 Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from initial issuance of convertible notes | $ 130,000 |  |  |
Period of option for additional issuance | 30 days |  |  |
Proceeds from additional issuance of convertible notes | $ 20,000 |  |  |
Interest rate (as a percent) |  | 4.25% |  |
Conversion rate |  | 22.2222 |  |
Conversion price (in dollars per share) | $ / shares |  | $ 45.00 |  |
Sales price of common stock as percentage of conversion price for redemption at Company's option |  | 130.00% |  |
Number of trading days that threshold percentage exceeds stock price for trigger of redemption at Company's option | item |  | 20 |  |
Period of consecutive trading days that the threshold of trading days must fall within for trigger of redemption at Company's option | D |  | 30 |  |
Redemption prices as percentage of outstanding principal amount plus accrued and unpaid interest following occurrence of certain tax related events |  | 100.00% |  |
Convertible notes |  |  | 126,476 |
Carrying value of convertible notes |  | $ 127,428 |  |
Unamortized issuance costs |  | $ 72 | 1,024 |
Effective interest rate (as a percent) |  | 4.96% |  |
Amortization of financing costs |  | $ 953 | 907 | $ 898
Interest expense |  | 5,419 | 5,419 |
2014 Notes | Other payables |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Accrued interest |  | $ 2,008 | $ 2,008 |

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- Definition The period of option available to initial purchasers of convertible debt instruments for purchase of additional convertible debt instruments, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition The cash inflow from the additional issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder. + References No definition available. + Details
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